Rope-lock for pulleys



A. J. BERGERON. ROPE LOCK FQR'PULLEYS. APPLICATION FIL'ED OCT- 2. 1919.

Patented July 13, 1920.

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UNITED T S? ARTHUR J. BERGERON, or NEW YORK, iv. Y.

' ROPE-LOCK FOB. PULLnYs.

Specification of Letters Patent. P t fed J ly 13 1920.

Application filed O'ctober 2, 1919. Serial No, 328,000.

To all whom it may concern: 1

Be it known that LARTHUR J. BERGERON, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented new and useful Improvements in Rope-Locks for Pulleys, of which the following is a speci- This invention relates to safety devices or attachments for pulleys and more par- .ticularly to a rope lock for thesame.

One of the principal objects-ofthe invention is to provide 'a simple and effective lockof the class described which is adapted to be attached to the fall element of a tackle, said lock automatically functioning to grip therope when the same moves therethrough inone direction.

Another :object in view is to provide means for temporarily rendering the lock inoperative, said .means being adapted to be controlled by a person. on the ground through themedium of the free end of the rope which may bemanipulated to accomplish-this purpose. v Q

Another object is the provision of means for rendering the locking means inactive, the same being especially adapted to be employed on tackle used in connection with scaffolding to prevent a person on the ground from tampering with the safety mechanism with a View" of rendering the same inactive temporarily.

in view, the invention resides in the novel construction, combination and arrangementof parts, more fully described and illustrated in the following description and accompanying drawings, and particularly pointed out in the following claims. j

'lVhile there has been described and illustrated a single and preferred embodiment of the: invention, it is to be understood that no limitation is necessarily made to the precise details ofconstruction, but that changes and alterations which fall within the scope of theappended claims maybe resorted to 'when found desirable.

linesthe' position of the jaws and coopen atingparts when they are actively engaging the rope. Y

a Fig. 2 is a plan view of the same.

Fig. 3 is a side elevation showing the invention applied to a tackle and illustrating the safety catch thrown to .its position for limiting the downward movement of the aws. r

Fig. 4 is a similar view illustrating the catch in a position 'to limit thev upward movement of-the jaws when the block and block arrangement of the tackle is used.

Referring to the drawings bycharacters of reference, 10 desig'n-atesthe fall block of a tackle to which is applied the supporting frame 11, said frame including horizontal and vertical side.bars;12.12 and13-13,

the latter being. preferably secured to the eye of the hook;14c, by meansv of spaced" which is pivotally suspended the U-shaped.

yoke 16, 'the bight of which constitutes a jaw 17. A transverse rivet 18 is passed through the vertical side bars 12 in relative spaced relation with respect to the rivet 15 and pivotally suspendedt-herefrom is a second U-shaped yoke member 19, theinner The horizontal bars.

face of the bight of which'constitutes a aw l 20. The free end of the yoke 16 is adapted to work between the side branches of'the yoke. ,19 and is guided. inits movements through the medium of a pair of spacedtrunnions21 formed on and extending from opposite sides of the yoke 16, forembracing engagement; with theupper' and lower sur-' faces of the side branehesofthe yoke 19..

By this construction it will be seen that an upward movement of theyokes will cause relativemovement of the jaws 17 and -20 toward each other for thepurpose of setting up a binding action on'the rope. When the tackle is used as a hoist, the mechanism acts as a safety device forthe reason that sud- I den retrograde movement of the rope between the aws will tend to raise the yokes,

thereby moving the jaws relatively toward 7 each other for binding the rope therebetween.

In order 'to provide -means for temporarily rendering the grlpping j aws'inactive,

to allow of'a free movement of the rope-in l a reverse direction whereby the fall block may be lowered, a locking mechanism for retaining thejaws in relative spaced relation is illustrated and comprises a latch member 22, pivoted on a transverse rivet 23 passing through the side arms of the yoke 16 adjacent its bight, said latch member is cut away at its free end to provide a hook 24, for engagement with the rivet 18.

In order to provide means for regulating the latch member whereby it may be controlled from the ground by the free end of the rope, a gravity pawl 25 is provided, the same being pivoted on a transverse rivet 26 passed through the vertical side bars 13. The gravity pawl is preferably of V-shaped formation and the extremity 27 of its upper arm is adapted to normally contact with the rivet 18 to prevent the cut away portion of the latch from engaging over the said rivet every time the jaws are moved up and down. When it'is desired torender the gripping jaws inactive by effecting the engagement of the latch with therivet 18, the rope is manipulated in such a manner as to lift the jaws until they assume the position shown in dotted lines in Fig. 1. The jaws are then allowed to slowly gravitate until the nose 28" .ofthe latch engages the extremity 27 of the pawl. Further downward movement will lift the pawl sufficiently to allow the cut away portion 24 to engage over the rivet 18; The

. inner face 28 of the nose will lock the yokes against upward movement, as thepivot 23 must necessarily move away from'the rivet cause theyokes to gravitate to the position substantially as illustrated in Fig. 4. By

this action the rivet 23 tends to move toward the rivet 18, at the same time forcing the inclined face 24 against the rivet thereby lifting and turning the latch until the nose 28 moves over the extremity 27 of the pawl. It will therefore be seen that by the construction and arrangement herein before described, it ispossible for a person on the ground to control thedevice by the rope,

even though the fall block has been elevated to a position well out of reach.

Where the device is used in connection with tackle for scaffolding it has been found necessary to provide means located on the device which can only be controlled by a person on the scaffold and use is therefore made of a safety catch 29, pivoted at 30 to one of the side. arms of the yoke 19. The

catch is providedwith a sto a lug 81 formed bythe inturned portion. aid stop lug is the rivet 18. When it'is desired to arrange the tackle in what is known-as a block and block arrangement, the catch 29 is thrown to the position illustrated in Fig. 4: and in this position the stop lug is arranged to comovement of'thej yokes, in orderthat the fall. block 10 may be pulled downby the act with the trunnions 21 'to limit upward free end of the rope which hasbeen previously engaged over the hook 1 1.

What is claimed as new is 7 1. A rope lock comprising a pair of pivotally hung cooperating jaws, means for. permitting free movement of the rope therebetween in one direction and for automatically locking the rope against movement in the opposite direction, and means for locking said jaws in spaced apart relation to permit of free movementof the rope'in either direction, and for locking said movement in either direction. v

2. A rope lock including a pair ofipivotally hung cooperating v jaws, means for permitting free movement of the rope therebetween in opposite directions and for looking the rope against movement in either direction. v v

3. A rope lock comprising a supporting member, a pair of cooperating-rope gripping jaws, each mounted on a swinging arm, said arms pivotally mounted in spaced apart relation in said member whereby the raising and lowering of said arms relativeto their rope against pivot points causes a relative movement of the jaws toward and from each other togrip or release the rope, and means for restricting 1 the opening movement of said aws.

4:. A rope lock comprlsing a supporting member, a pair of cooperating rope gripping jaws, each mounted on a swinging arm, said arms plvotally mounted in spaced apart relation in said -meinber whereby the raising and lowermg of sald arms relative to their pivot polnts causes a .rel'atlve movement of the jaws toward and from each other'to grip or release the rope, and means for'restrict ing the closing movement of said jaws.

5. A rope lock comprising a supporting member adapted to be attached to a pulley block, a pair of eoiiperating rope gripping jaws, an arm carrying each jaw pivoted at one end in spacedapart relation Vtdsaid member, means for guiding one j aw; on the arm of the other jaw, and means for locking said jaws relative to each other'to control their closing movement. a

6. A rope lock comprising a supporting member, a pair of arms pivoted thereto in spaced relation, cooperating rope grippmg jaws mounted on said arms at their free.

extremities, means on one of said arms 00- operating with the remaining arm to cause relative movement of the jaws toward and away from each other when the arms are raised or lowered and means for restricting the upward movement of the arms.

7. A rope lock comprising a supporting member, a pair of arms pivoted thereto in spaced relation, cooperating rope gripping jaws formed on said arms at their free extremities, means on one of said arms cooperating with the remaining arm to cause relative movement of the jaws toward and away from each other when the arms are.

raised or lowered, means for restricting the Y upward movement of the arms and a device pivotally mounted on. the supporting member having a portion normally obstructing the operation of the restricting'means, said ARTHUR J. BERGERON. 

